KCNA Kubernetes Fundamentals Practice Question
Which THREE of the following are true about Kubernetes labels and selectors?
⚠ Common exam trap
CNCF often tests the misconception that labels are immutable like certain other Kubernetes fields, but labels are explicitly designed to be mutable for dynamic resource management.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set-based selectors support operators like 'In' and 'NotIn'
Kubernetes set-based selectors support operators like 'In', 'NotIn', 'Exists', and 'DoesNotExist', allowing more flexible matching than equality-based selectors. This is defined in the Kubernetes API specification for label selectors, enabling complex filtering of resources.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Labels are encrypted at rest by default
Why it's wrong here
Labels are not encrypted; they are stored in plaintext in etcd unless encryption is configured.
- ✓
Set-based selectors support operators like 'In' and 'NotIn'
Why this is correct
Set-based selectors support 'In', 'NotIn', 'Exists', and 'DoesNotExist'.
- ✓
Selectors can be used by Services to identify which pods to route traffic to
Why this is correct
Services use label selectors to determine the pod endpoints.
- ✗
Labels are immutable after creation
Why it's wrong here
Labels can be modified using kubectl label.
- ✓
Labels can be used to organize and select subsets of objects
Why this is correct
Labels are key-value pairs used to organize and select objects.
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